| 摘要 |
<p>PROBLEM TO BE SOLVED: To precisely determine the color at an optional light receiving angle within a wide range by calculating a regression expression and a regression coefficient by measured spectral reflectances at specified five angles, and determining the spectral reflectance at a desired angle. SOLUTION: The light receiving angle to a metallic paint film 1 is divided to 10-20 deg., 20-30 deg., 30-50 deg., 50-80 deg. and 80-110 deg.. The spectral reflectance at an optional angle of each section is measured by a portable spectrometer. A computer 3 determines three regression expressions and a regression coefficient within a prescribed light receiving angle range from the five spectral reflectances, and calculates a calculated reflectance at an interval of 1 deg. between receiving angles of 10 deg. to 110 deg.. After conversion into three stimulus values XYZ from the spectral reflectance, the emitting intensities of phosphors RGB of a monitor 5 are calculated from the characteristic table of a graphic monitor to display the table. Thus, the colorimetrically precise computer graphics of the metallic paint color can be inexpensively performed in a short time with a small-sized device.</p> |
